Keystones — Capstone
Five GCSE retrieval questions · 29 October 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√80
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: 4x² - 16x - 8
Answer: 4(x - 2)² - 24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 15cm, angle = 51°. Give your answer to 2 decimal places
Answer: 122.4cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 35:28:8 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 74, 39, 33, 88, 45, 97, 73, 43. Give your answer to 2 decimal places
Answer: Mean = 56.11, Median = 45, Range = 84